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License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

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    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

Class
    Foam::solvers::shockFluid

Description
    Solver module for density-based solution of compressible flow

    Based on central-upwind schemes of Kurganov and Tadmor with support for
    mesh-motion and topology change.

    Reference:
    \verbatim
        Greenshields, C. J., Weller, H. G., Gasparini, L.,
        & Reese, J. M. (2010).
        Implementation of semi‐discrete, non‐staggered central schemes
        in a colocated, polyhedral, finite volume framework,
        for high‐speed viscous flows.
        International journal for numerical methods in fluids, 63(1), 1-21.
    \endverbatim

SourceFiles
    shockFluid.C

See also
    Foam::solvers::basicFluidSolver
    Foam::solvers::incompressibleFluid

\*---------------------------------------------------------------------------*/

#ifndef shockFluid_H
#define shockFluid_H

#include "basicFluidSolver.H"
#include "psiThermo.H"
#include "compressibleMomentumTransportModel.H"
#include "fluidThermoThermophysicalTransportModel.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{
namespace solvers
{

/*---------------------------------------------------------------------------*\
                          Class shockFluid Declaration
\*---------------------------------------------------------------------------*/

class shockFluid
:
    public basicFluidSolver
{

protected:

    // Thermophysical properties

        //- Pointer to the fluid thermophysical properties
        autoPtr<psiThermo> thermoPtr_;

        //- Reference to the fluid thermophysical properties
        psiThermo& thermo_;

        //- Reference to the pressure field
        volScalarField& p_;

        //- The continuity density field
        volScalarField rho_;


    // Kinematic properties

        //- Velocity field
        volVectorField U_;

        //- Mass-flux field
        surfaceScalarField phi_;

        //- Kinetic energy field
        //  Used in the energy equation
        volScalarField K;


    // Momentum transport

        bool inviscid;

        //- Pointer to the momentum transport model
        autoPtr<compressible::momentumTransportModel> momentumTransport;


    // Thermophysical transport

        autoPtr<fluidThermoThermophysicalTransportModel>
            thermophysicalTransport;


    // Controls

        word fluxScheme;


    // Cached temporary fields

        tmp<surfaceScalarField> pos;
        tmp<surfaceScalarField> neg;

        tmp<surfaceScalarField> rho_pos;
        tmp<surfaceScalarField> rho_neg;

        tmp<surfaceVectorField> rhoU_pos;
        tmp<surfaceVectorField> rhoU_neg;

        tmp<surfaceVectorField> U_pos;
        tmp<surfaceVectorField> U_neg;

        tmp<surfaceScalarField> p_pos;
        tmp<surfaceScalarField> p_neg;

        tmp<surfaceScalarField> a_pos;
        tmp<surfaceScalarField> a_neg;

        tmp<surfaceScalarField> aSf;

        tmp<surfaceScalarField> aphiv_pos;
        tmp<surfaceScalarField> aphiv_neg;

        tmp<surfaceVectorField> devTau;

        //- Optional LTS reciprocal time-step field
        tmp<volScalarField> trDeltaT;


private:

    // Private Member Functions

        //- Set rDeltaT for LTS
        void setRDeltaT(const surfaceScalarField& amaxSf);

        //- Correct the cached Courant numbers
        void correctCoNum(const surfaceScalarField& amaxSf);

        //- Construct the continuity equation and correct the density
        void correctDensity();

        //- Interpolate field vf according to direction dir
        template<class Type>
        inline tmp<SurfaceField<Type>> interpolate
        (
            const VolField<Type>& vf,
            const surfaceScalarField& dir,
            const word& reconFieldName = word::null
        )
        {
            tmp<SurfaceField<Type>> tsf
            (
                fvc::interpolate
                (
                    vf,
                    dir,
                    "reconstruct("
                  + (reconFieldName != word::null ? reconFieldName : vf.name())
                  + ')'
                )
            );

            SurfaceField<Type>& sf = tsf.ref();

            sf.rename(vf.name() + '_' + dir.name());

            return tsf;
        }

        void fluxPredictor();

        void clearTemporaryFields();


public:

    // Public Data

        //- Reference to the fluid thermophysical properties
        const psiThermo& thermo;

        //- Reference to the pressure field
        const volScalarField& p;

        //- Reference to the continuity density field
        const volScalarField& rho;

        //- Reference to the velocity field
        const volVectorField& U;

        //- Reference to the mass-flux field
        const surfaceScalarField& phi;


    //- Runtime type information
    TypeName("shockFluid");


    // Constructors

        //- Construct from region mesh
        shockFluid(fvMesh& mesh);

        //- Disallow default bitwise copy construction
        shockFluid(const shockFluid&) = delete;


    //- Destructor
    virtual ~shockFluid();


    // Member Functions

        //- Called at the start of the time-step, before the PIMPLE loop
        virtual void preSolve();

        //- Called at the start of the PIMPLE loop to move the mesh
        virtual void moveMesh();

        //- Corrections that follow mesh motion
        virtual void motionCorrector();

        //- Called at the start of the PIMPLE loop
        virtual void prePredictor();

        //- Predict the momentum transport
        virtual void momentumTransportPredictor();

        //- Predict thermophysical transport
        virtual void thermophysicalTransportPredictor();

        //- Construct and optionally solve the momentum equation
        virtual void momentumPredictor();

        //- Construct and solve the energy equation,
        //  convert to temperature
        //  and update thermophysical and transport properties
        virtual void thermophysicalPredictor();

        //- Construct and solve the pressure equation in the PISO loop
        virtual void pressureCorrector();

        //- Correct the momentum transport
        virtual void momentumTransportCorrector();

        //- Correct the thermophysical transport
        virtual void thermophysicalTransportCorrector();

        //- Called after the PIMPLE loop at the end of the time-step
        virtual void postSolve();


    // Member Operators

        //- Disallow default bitwise assignment
        void operator=(const shockFluid&) = delete;
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace solvers
} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //
